摘要
针对传统空时结构宽带波束形成器结构复杂、计算量大和稳健性差的问题,提出低复杂度的稳健宽带波束形成算法。首先给出频率变化时阵列响应相位,分析频率变化与角度变化对阵列响应相位的影响。通过对期望信号不同频点施加阵列响应幅度和相位约束,补偿不同频率间的阵列响应相位差来实现无需延迟线或FIR/IIR滤波器结构的稳健宽带波束形成。然后分析频率和角度同时变化对阵列响应相位的影响,在期望信号来向附近引入辅助方位角,进一步提高期望信号来向趋于零度和相对带宽较小时算法的稳健性。理论分析与仿真实验表明,本文算法结构简单,计算复杂度较低且具有较好的稳健性。
To solve the computation complexity and robust problems of conventional space‐time wideband beamformer structure ,a low complexity robust algorithm is proposed .Firstly ,the array response phase when the frequency changes is given ,and the influence of frequency change and angle change on the phase of array response are analyzed .Through imposing magnitude and phase constraints to compensate the phase differences between different frequencies for desired signal ,robust wideband beamforming is a‐chieved without delay lines or FIR/IIR filter .Furthermore ,by analyzing the impact on array response phase when the frequency and angle change simultaneously ,the auxiliary azimuth in the vicinity of de‐sired signal is taken into account ,and the robustness of the algorithm is improved when the arrival direc‐tion of the desired signal tends to zero and the relative bandwidth is small .The theoretical analysis and simulations show that the algorithm has simpler structure ,lower computational complexity ,and better robustness than traditional algorithm .
出处
《数据采集与处理》
CSCD
北大核心
2016年第6期1185-1191,共7页
Journal of Data Acquisition and Processing
基金
国家高技术研究发展计划("八六三"计划)(2011AA7031015)资助项目
关键词
宽带波束形成
稳健性
相位约束
低计算复杂度
辅助方位角
wideband beamforming
robustness
phase constraints
low computational complexity
aux-iliary azimuth
